Final answer:
Graphics and text of products on a dietitian's website function as promotional components, aimed at attracting attention and engaging potential clients.
Step-by-step explanation:
The component of a dietitian's website that serves as a form of promotion is d. graphics and text of products. This element is considered promotional because it showcases and highlights the services or products the business offers, potentially influencing the decision-making of potential clients. Providing engaging visuals and persuasive descriptions can effectively attract and retain the attention of website visitors, thereby serving promotional purposes.
Other components listed, such as an online order form, price and availability information, and the e-mail address, serve more functional roles on the website. For example, an online order form simplifies the transaction process, while price and availability give necessary purchasing details, and an e-mail address offers a direct communication method.